Calculating-machine.



A. F. POOLE. CALCULATING M ACHINE. APPucATloN FILED sEPT.1e, 1912. RENEwED ocr. 15,1915.

Patented Sept. 12, 1916.

3 SHEETS-SHEET l.

A. F. POOLE.

y CALCULATING MACHINE. ,WPHC/111011HLEDsEPme, 1912. RENEwEn ocr. 15.1915.

Patented Sept. 12, 1916.

3 SHEETS-SHEET 2.

A. F. POULE.

CALCULATING MACHINE.

APPLICATION FILED SEPT. 16, 1912. RENEWED OCT. 15.1915.

PatentedSept.. 12, 1916.

3 SHEETS-SHEET 3.

mi) STATES PATENT OFFICE.

ARTHUR F. POOLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO WAHL ADDING MACHINE COMPANY, OF WILMINGTON, DELAWARE.

CALCULATING-MACHINE.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application led September 16, 1912, Serial No. 720,619. Renewed October 15, 1915. Serial No. 56,130.

To all 'whom it may concern.' Y

Be it known that I, ARTHUR F. POOLE, of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Calculating-lilachnes, of

which the following is a specication.

My'invention is a calculating machine of the type used as an attachment to the Remington typewriter. In it are a set of totalizers mounted on a bar rigid with the typewriter carriage'l These totalizers are adapted to perform calcula-tions with numbers arranged in vertical columns. They may therefore be termed columnar totalizers. In the calculating' machine is a second totalizer which reciprocates over a limited Zone. This second totalizer may perform calculations-with numbers arranged in any order on the paper, usually however, it performs calculations with numbers arranged in horizontal lines, or what is termed crossfooting. Throughout this application this second ttalizer will be called the universal totalizer. As the carriage moves from right to left the columnar totalizers pass over a master -mechanlsm and thereby have numbers inserted .seratz'm in them. A similar master mechanism is provided for the universal totalizer, which totalizer is adapted to ybe connected to, and afterward move with, any columnar totalizer during the insertion of a number; consequently the same number is thereby inserted in both totalizers. This number may be inserted in either totalizer positively or negatively.

It may sometimes happen that a number is intended to be 'entered into both a columnar and the unitersal totalizer, and the latter, owing to failure of the connecting mechanism between the two is not in position to receive such number. Unless the operator noticed that the number which he was inserting in the machine was not entered into the universal totalizer and should correct such error immediately, the universal totalizer would make a wrong calcula-y tion.

It is oneof the objects of my invention to vide an elastic connection between the co` lumnar and the universal totalizers, so that the latter may be connected to the former without a jar.

There are a great number of parts in the calculating machine described in this application which are not necessary to the understanding of my invention. They would simply confuse the novel parts which I shall afterward describe and have accordingly been omitted. Bearing this in mind reference may be had to the accompanying drawings forming part of the specification.

Figure 1 is a front elevation of the machine. Fig. 2 is a right elevation. Fig. 3 is a plan, and Figs. 1, 5, G, 7 and 8 show variousdetails, which will be referred to as o'ccaslon arises in the following specification. l

I shall rst describe the elastic connection between the columnar and universal totallzers. The calculating-machine is mounted on the framework of the ordinary Remingtontypewriter. Moving rigid with the typewriter carriage is a bar 1, which carries the columnar totalizers, 9., 8, and 4. These are easily adjustableon the bar 1. At the side of the machine and rigid with the framework are two guides, 1. Sliding on these guides is a bar 2 on which is `mounted the universal total- 1Zer, 3". Rigid with the bar 2 is a tube l, to one end of which is attached a spring 5 fastened `to an end plate 6, which is rigid with the frame of the machine. The bar 2 has a projection 7 on which is pivoted a link 8 at a point 9. Pivoted on the link 8 is a connecting bar 10. On the link S is a pin 1l which engages in a slot 12 in the projection 7 and forms the pivot of the bar 10 on the link 8". A spring 13 serves to hold the pin 11 against the right end of the slot 1Q A spring 14 between the bar 10 and the link 8 tends to rotate the bar 10 in a clockwise direction. On the end of the connecting bar 10 is a hook 15. Each of the columnar totalizers, 2, 3, and '-l, has its right side plate extended and the hook 15 is adapted to engage with these extensions. A slot 16 is provided in the bar 1t which slot engages with a pin 1T rigid in the frame of the machine.

In Fig. 1 the hook 15 is` shown engaged with the columnar totaliZer 3. As the typewriter carriage moves to the left thereby lot carrying the columnar totalizer with it, the universal totalizer 3 will move to the left also. When the right end of slot 16 has reached the pin 17 the cam surface on the slot 1G will rotate the connecting bar 10 in a counterclockwise direction, thereby disengaging hook 15 from the side plate of the columnar totalizer 3. Inder the influence of the spring 5 the universal totalizer 3 will return to the position shown in Fig. 1. The hook 15 will then bein a position to engage with the side plate of the columnar totalizer 4. Thus it will be seen that as the carriage moves to the left the universal totalizer will move in unison with the columnar totalizer until a certain point has been reached. It will then disengage itself from said columnar ttaliZer and return to its normal position, ready to be engaged by the succeeding columnar totalizer.

It is to be noted that the extensions on the columnar totalizers engaged by the hook 15 are on the rigl'it side plates of these totalizers. From this it follows that the disconnection of the hook 15, occurring on its engagement with the pin 17, is independent of the position of the left side plate at that time. The width of one of these totalizers, of course, is determined by the distance of the left side plate from the right one, and since this left side plate has no function whatever during the disconnection of hook 15 its distance at the time of disconnection is immaterial to the disconnection itself consequently th'e universal totalizer will bc disconnected from the columnar totalizers when these columnar totalizers are of varying widths.

The typewriter on which this calculating machine is mounted is provided with a set of tahulating keys. Assume that a number has linst been inserted in a columnar totali'/.er and that instead of advancing the next succeeding columnar totalizer to its proper place by successive manipulation of the space bar, it were advanced by the manipulation of a tabulator key. The typewriter carriage would at once start moving to the left, the hook 15 through the action of pin 17 in slot 10 Ywould be disengaged from the columnar totalizer and under the influence ot' the spring 5, the universal totalizer 3 would start to move to the right, carrying ot' course hook 1.5 with it. But before this normal position would be reached the hook 15 would become engaged with the right side plate of the next succeeding columnar totalizer. I/Vhen this engagement takes place the bar 10l is going in one direction and the columnar totalizer and the carriage on which are mounted the columnar totalizers is going in the opposite direction. lf the bar 10 were rigid with the universal totalizer 3, an undesirable jar would thereupon result. However 'in my present invention this jar is modified by the spring 13, since in accordance with the aforedescribed construction, this spring 13 acts as a buffer between the bar 10 and the universal totalizer 3. The tension o1 the spring 13 is much stronger than that of the spring 5 so that after spring 13 has yielded in consequence of the engaging blow, 13 will pull the pivot 11 against the righthand side of the slot 12 and thereafter the bar 10 will act as if it were rigid with the universal totalizer 3,

I ywill now describe the means by which the calculating machine is locked when the universal totalizer is not in a position'to receive a number which is intended to be entered therein.

So far I have said nothing, about the master mechanisms which are used to enter numbers in the columnar and universal totalizers. The typewriter is provided with digit keys` and a reciprocatory motion of these digit keys is ultimately transformed into rotary motion of master wheel 20 engaging with the columnar totalizers. This motion varies in amount according to the particular digit key which is actuated. At the same time any digit key is actuated, and before the motion of the master wheel begins, the 'master dogs 21and 21 move from their full to their dotted positions. rIhe direction of rotation of the master wheel 20 engaging with the universal totalizer is determined by the position of a calculation determinator 22 This calculation determinator may occupy lany one oi three positions. In one position, that is to the extreme left, the master wheel 20 will revolve in a direction to insert a number positively into the universal totalizer 3, on the actuation of a digit key. In the middle or disconnect position the master wheel 20 will be stationary during the "actuation of a digit key. In the third.I or extreme right position, the master wheel 20 will revolve in a direction to insert a number negatively into the universal totalizer 3, upon the actuation of a digit key. It will be seen that the calculation determinator 22 determines the particular kind of calculation which shall be done by the universal totalizer 3, that is, that the universal totalizer shall receive a number positively, not at all, or negatively, according as the calculation determinator is in its left, middle or right positions.

rIhe mechanism for connecting the digit keys with the master wheel 20 and the master dog 21 is shown and described in the patent to Plohn C. IVahl Number 893.719, July 23, 1908. Mechanism for connecting the master wheel 20 and the master dog 21 to the digit keys is shown and 'Fully described in my copending application Serial Number 709010 filed July 12,

incensi 1912. The particular mechanism by which the calculation determinator 22 determines the kind of calculations performed by the universal totalizer is also disclosed and fully described in the above mentioned application, therefore 1 shall not describe any of these above mentioned mechanisms, but shall start my description of the interlock on the following assumptions: First: that onl a depression `of a digit key of the typewriter that the master wheel 20 will revolve an amount corresponding to the digit key depressed, and the master dog-21 will move from its full to its dotted position, Fig. 2. Second: on such movement of the digit key the master dog 21 will move from its full to its dotted position. Third: on depression of the digit key the consequent direction of motion of the master wheel 20 will be determined by the position of the calculation determinator 22.

Pivotally mounted on the universal totalizer bar 2, at 31, is a lock 23 held by a spring 24: against a stop 25 (best shown in Figs. 2 and 5). When the universal totalizer bar 2 is in its normal position the lock 23 is in the same vertical plane as the master dog 21. Depressing any digit key will rotate the master dog 21 from its full to its dotted position. If the universal totaliz'er bar 2 is in its normal position the lock 23 will be coincidently rotated in a clockwise direction. Moving in a pillar 26 (Fig. 6) in the framework is a slider 27 (Figs. 7 and 8), attached to an arm 29 rigid with the calculation determinator 22. A vertical slot 30, in the pillar 26, is in the same vertical plane as the master dog 21. A slot 28 in the slider 27 registers with the slot 30 when the calculation determinator is in its middle position. -When the universal ,totalizer bar 2 is in its normal position the lock 23 registers with the slot 30 also. Consequently if the calculation deterininator is in its middle or disconnect position, the lock 23 will be tree to enter the slot 30 when said lock is caused to rotate by movement of the master dog 2l, from its full to its dotted position. However suppose the calculation determinator is in either of its extreme positions when the totalizer bar 2 is in its normal position. Then the slot 28 will no longer be in registry with the slot 30 and the motion of the lock 23 will be prevented by the part of slider' 27 which lies adjacent te the slot 28 Preventing rotation of the lock 23 will of course prevent motion of the master dog 2l and consequently ot the digit keys and the calculating machine will be locked. Having given a description of the particular mechanism by which this lock is accomplished l will now go into the operation 0f it.

The width of the universal totalizer greater than that of any of the columnar totalizers since the universal totalizer must have capacity enough to exhibit the sum of the largest numbers which can be exhibited by the columnar totalizers. Consequently whenever a number is being inserted in a columnar totalizer the universal totalizer 3 is displaced from its normal position. lt will be remembered that the lock 23 is engaged by the master dog 21 only'when the universal totalizer bar 2 is in its normal position. 1n any other position lock 23 1s not in the same vertical plane as the master dog 21 and consequently is hot rotated by it. Therefore Whenever the bar 2 is displaced from its normal position, which is the case when a number is being inserted in the universal totalizer 3, the lock is ineffective owing to the lock 23 and master dog 21 being in different planes.` But should the hook 15 accidentally become disconnected from the totalizer With which it was engaged, the universal totalizer bar 2 under the influence of the spring 5 would at once snap back to its normal position, and further operation of the machine would thereby be prevented. This last statement however has one exception. It may be desired to insert a number into a columnar totalizer only. Furthermore, to avoid the useless reciprocation of the universal totalizer during such insertion the columnar totalizer would have the extension on its side plate normally engaging the hook 15 removed. Theuniversal totalizer will then rest in its normal position during insertion of the number in the columnar totalizer and the calculation determinator 22 would be in its middle or disconnect position. Bearing in mind that owing to the link connection of the actuators for the columnar 'and universal totalizers locking one also locks the other it is obvious that theV lock 23 would prevent the insertion of a -number in the columnar totalizer. Consequently it is necessary to have the lock 23 inoperative in the above recited case. This is provided for bv the insertion of the slot 28 in the bar 275.

From the aforegoing description it is evident that the lock 23 is effective when two conditions coincide, first, the universal totalizer 3 is'in its normal position; second, the calculation determinator 22 is in either of its extreme positions, which extreme positions determine that a number shall go into the universal totalizer on the actuation of a digit key. The universal totalizer should not be in its normal position when a number is to be entered into it, consequently this lock will insure the totalizer being in a position to receive a number when the calculation determinator determines that a number shall go into the universal totalizer.

Besides guarding against accidental uuiookiug ot' the universal totalizer trom a columnar totalizer before a number has been completely inserted, this lock also guards against the operators not returning the typewriter carriage far enough after the completion of any line, for the first columnar totalizer to engage the universal totalizer. In such a case on starting to insert a number which was desired to be entered into both totalizers the calculation determinator will of course be in one or the other of its eXtreme positions but the universal totalizer not being connected to the first columnar totalizer would remain -in its normal position as the carriage moved to the left. Consequently the whole calculating machine would be locked. This would at once call the attentiorof'tleoperator to his mistake and allow correction of the same before any number was inserted in the machine.

In case it is desired to insert a number not to be calculated such as a date, for instance, in a space in which the machine would be normally locked the machine may be unlocked by throwing the calculating determinator 22 to its disconnect position.

In the machine herein described the reciprocatory universal totalizer is comparatively heavy since it includes not only the universal totalizer itself, but the sliding bar on which said totalizer is mounted and the connecting bar. /t'iis apparent that the elastic connecting bar in this case is of much greater advantagethan in case the reciprocatory member were theI master wheel and the stationary member the totalizer. However this elastic connection between the columnar and universal totalizers is of advantage in either case since it modifies the blow which occurs when the columnar moving element engages the universal moving element.

In some of the claims I have used the term means to lock said calculating machine by which I mean a lock rendering the machine inoperative in so far as operation of the numeral keys is concerned. The particular location of this lock is cf minor importance. In this present application I have shown it as operated by the master dog 211. It is obvious that there are a number of other places in the machine where this lock might be placed. 'For instance, in copera tion with the master wheel. 20, the master wheel 20., the master dog 2,1, the various shafts which serve to operate the above mentioned parts, et cetera. However all of these parts have one feature in common, that is, preventing the motion of any one of them will prevent the operation of the numeral keys and so lock the machine.

In a calculating machine of the type described that is, those-in which the digits of a number are entered into a totalizer seriatz'm, there is necessary a member which moves step by step to determine the proper decimal place'for the insertion of each digit.

I call this movable member a decimal carriage. In my present invention -the decimal carriage is the totalizer itself; however the totalizer may be stationary and the master wheel reciprocate, or for instance a set of triggers may be used and a piece to engage serz'atz'm witlrthe triggers may reciprocate. My present invention may be applied to any of such constructions and in the claims I have accordingly called the reciprocating member a decimal carriage.

It will be observed in my present invention that the locations on the typewriter carriage which determine the points at which the universal totalizer shall be connected to the said carriage are the columnar t'otalizers themselves. AIt is'obvious that instead of using the columnar totalizers a series of stops might be put on the typewriter carg5 riage or a bar having slots atpredetermined points might `be used, so I have accordingly in the claims called the points on the carriage at which the universal totalizer will be connected to the carriage, the connecting locations.

Many changes may be made in the precise construction herein disclosed Without departing from the spirit thereof.

Having thus described. my invention, I claim: y

1. In a calculating machine the combination of, a decimal carriage, a second decimal carriage adapted to be intermittently connected to said first decimal carriage to thereby calculate in a certain zone, a totalizer and actuating mechanism therefor associated with -each decimal carriage, and a lock for said actuating mechanism, said lock being rendered ineffective when said second decimal carriage enters a calculating zone.

2. In a calculating machine the combination of, a totalizer, a second totalizer, a decimal carriage for said first totalizer, a decimal carriage for said second totalizer, said decimal carriage being held in a normal position by a spring, means to enter a number in both totalizers simultaneously, and means to prevent operation of the calculating machine when said second decimal carriage is in its normal position.

3. In a calculating machine the combination of, a totalizer, a second totalizer, a decimal carriage for said first totalizer, a decimal carriage for said second totalizer, said decimal carriage being held in a normal position by a spring, a set of numeral keys adapted to enter a number in both totalizers simultaneously and means to prevent the operation of said numeral keys when said second decimal 'carriage is in its normal position.

4. In a calculating machine the combination of a moving carriage, a totalizcr, mechanism to insert a number therein, mechanism intermittently connecting said totalizer to said moving carriage, a spring tending to hold said totalizer in a normal position out of engagement with said number inserting mechanism, and a lock brought into operation when said totalizer is in its normal position to thereby prevent the operation of said numberinserting mechanism.

5. In a calculating machine, the combination of a moving carriage, a totalizer, mecha* nism to insert the number therein, means to connect and disconnect said totalizer from said carriage during a single traverse of said carriage, a spring tending to hold said totalizer out of operative relation With said number inserting mechanism, and a lock brought into operation when said totalizer is in its normal position, and rendered ineective when said totalizer is displaced from its normal position.

6. In a calculating machine the combination of, a decimal carriage having a totalizer mounted thereon, a master dog adapted to coperate with said totalizer in its various decimal places, said totalizer moving relatively to said master dog, a spring tending to hold said decimal carriage in a normal position, a lock mounted on said decimal carriage, said lock being engaged by said master dog when said decimal carriage is in its normal position.

7. In a calculating machine of the type described the combination of: a totalizer; a` second totalizer; a decimal carriage for said first totalizer; a decimal carriage for said second totalizer said decimal carriage being held in a normal position by a spring; means to enter a number into both totalizers simultaneously; a calculation determinator for said second totalizer, said determinator having an operating and a nonoperating position; and means to prevent operation of the calculating machine when said second decimal carriage is in its normal position, and said calculation determinator is in its operating position.

8. In a calculating machine of the type described the combination of: a totalizer; a second totalizer; a decimal carriage for said first totalizer; a decimal carriage for said second totalizer said carriage being adapted to be connected to said first carriage and held in a -normal position by a spring; means to enter a number into both totalizers simultaneously; a calculation determinator for said second totalizer said determinator having an operating and a nonoperating position; and a lock effective to prevent the operation of said calculating machine when said second decimal carriage is in a normal position and said calculation determinator is in an operating position.

9. In a calculating machine of the type described the combination of: a totalizer; a second totalizer; a decimal carriage for said first totalizer; another decimal carriage for said second totalizer, said carriage being held in a normal position by a spring; means to enter a number into both totalizers simultaneously; a calculation determinator for said second totalizer, said determinator having an operating and a nonoperating position; a slider having a slot and moved by said calculation determinator; and a lock mounted on said second decimal carriage and actuated when said second decimal carriage is in its normal position, said lock engaging said slider when said calculation determinatoris in an operating position and entering said slot when said calculation determinator is in a nonoperating position.

10. In a calculating machine of the type described the combination of: a totalizer; a second totalizer adapted to be intermittently connected to said first totalizer and held in a normal position by a spring; means to enter a number into both totalizers simultaneously; a calculation determinator for said second totalizer, said determinator having an operating and a nonoperating position; and a lock effective to prevent a number being entered into said totalizer when said totaliZeris in its normal position and said calculation determinator in an operating position.

i1. In a calculating machine of the type described the combination of: a totalizer; a second totalizer held in a normal position by a spring; means to enter a number into both totalizers simultaneously; a calculation detern'iinator for said second totalizer, said determinator having an ope lating and a nonoperating position; and a lock effective to prevent a number being-entered into said first totalizer when said second totalizer is in its normal position and said calculation determinatorvis in an operating position.

12. In a calculating machine of the type described the combination of: a totalizer; a second totalizer adapted to be intermittently connected to said first totalizer and held in a normal position by a spring; means to enter a number into both totalizers; a calculation dcterminator having an operating and a nonoperating position; and a lock effective to prevent operation of' said calculating machine when said second totalizer is in a normal position and said calculation determinator is in an operating position.

13. In a calculatingmachine of the type described the combination of: a totalizer; a second totalizer held in a normal position by a spring; means to enter a number into both totalizers simultaneously; a calculation determinator for said second totalizer, said determinator having an operating and a nonoperating position; a slider having a slot and moved by said calculation determinator; and a lock moved with said second totalizer and actuated when said second totalizer is in its normal position, said lock engaging said slider when said calculation determinator is'in an operating position and entering said slot when said calculation determinator is in a nonoperating position.

14. In a calculating machine of the type described the combination of: a totalizer; mechanism to insert a number therein; a spring to normally hold said mechanism out of engagement with said totalizer; a cal-D culation determinator for said totalizer, said determinator having an operating and a nonoperating position; and means to lock said calculating machine when said mechanism is not in engagement with said totalizer and said calculation determinator is in its operating position.

15. In a calculating machine of the type described the combination of: a decimal carriage; a totalizer; mechanism to insert a number therein; a spring to normally hold said mechanism out of engagement with said totalizer; a calculation determinator for said totalizer said determinator having an op eating and a ,nonoperating position; and means to lock said calculating machine when ,said mechanism is not in engagement with said totalizer and said calculation determinator is in its operating position.

16. In a calculating machine of the type described the combination of: a totalizer; mechanism to enter a number therein; a spring to hold saidmechanism out of engagement with said totalizer; a calculation determinator for said totalizer said determinator having an operating and a nonoperating position; a slider having a slot and moved by said calculation determinator; and a lock moved with said totalizer and actuated when said totalizer is in its normal position, said lock engaging said slider When said calculation determinator is in an operating position and entering said slot when said calculation determinator is in a nonoperating position.

17. In a calculating machine, the combination of a moving carriage, a totalizer, said totalizer being adapted to be intermittently connected to said moving carriage during a single traverse thereof, mechanism to enter a number in said totalizer, means to move said totalizer and'actuating mechanism relatively to each other whereby numbers may be inserted in said totalizer by said actuating mechanism, and means to prevent the operation of said actuating mechanism when said totalizer is in a normal position.

18. In a calculating machine, the combination of a moving carriage, a decimal selector adapted to be intermittently connected to the moving carriage and to move synchronously therewith, said decimal selector having a normal position and being displaced therefrom by said `carriage, and.

niemesi means to lock the calculating machine when said decimal carriage is in said normal positiovn.

19. In a calculating machine, the combination oi" a moving carriage, a decimal selector adapted to be intermittently connected the moving carriage and to move synchronously therewith, a spring to return said decimal selector to a normal position, and means to lock said machine when said decimal selector is in said normal position.

20. In a calculating machine, the combination of a moving carriage having a series of connectingvlocations, a decimal selector adapted to move synchronously with said carriage when said selector is connected to any of said connecting locations, means tending to hold said decimal selector in anormal position, and means to lock said machine when said decilnal selector is in said normal position.

2l. In a calculating machine, the combination of a moving carriage, a series of connecting locations on said moving carriage, a decimal selector adapted to move synchronously with said carriage when connected to said connecting locations, means to intermittently connect and disconnect said decimal selector to said locations and means to lock said machine when said decimal selector is in a normal position.

22. In a calculating machine, the combination of a moving carriage, a series of connecting locations on said carriage, a decimal selector adapted to move synchronously with said carriage when connected with one of said connecting locations and having a normal position from which it is displaced by said carriage, and means to lock said machine when said decimal selector is in its normal position.

23. In a calculating machine the combination of a carriage, a decimal carriage, adapted to be intermittently 'connected to said carriage to thereby calculate iny a certain Zone, a totalizer and actuating mechanism therefor associated With said decimal carriage, and a lock for said actuating mechanism, said lock being rendered ineffective when said decimal carriage enters the calculating Zone.

Q4. In a calculating machine, the combination of a columnar totalizer, a universal totalizer. adapted to be connected thereto, a set of numeral keys adapted to insert numbers in both totalizers, and means for locking said numeral keys when said universal totalizer is disconnected from said columnar totalizer.

25. In a calculating machine, the combination of a decimal carriage, a second decimal carriage adapted to be intermittently connected thereto, a set of numeral keys, a lock for said numeral keys, said lock being normally ineffective, and means for rendering 'said lock operative coincident with a disconnection of said second decimal carriage from said first decimal carriage.`

26. In a calculating machine, the combination of a totalizer, a second totalizer adapted to be intermittently connected to said first totalizer, a set of numeral keys adapted to insert numbers in said totalizers, a lock for said numeral keys, a gear shift for said second totalizer to determine whether or not a number set up on the numeral keys shall be entered in said second totalizer, and means operated by said gear shift to render said lock ineffective.

27. vIn a calculating machine, the combination with twoseparately mounted calculating units, means for coupling the units to cause themto move together and be actuated to register the same transaction, and means for preventing a correcting actuation of one of the units independently of a corresponding actuation of the other unit.

28. In a calculating machine, the combination with two separately mounted calculating units, means for coupling said units to cause them to be actuated together, and means for preventing actuation of one of the units during the uncoupled relation of said A units.

.29.l In a calculating machine, the combination with two separately mounted calcu lating units, means controlled by the movement of one of the units for coupling up and moving the other unit and for effecting the combitermittently effect operation of one unit by the operation of the other, and means preventing separate actuation of one of the units when the actuating mechanism is not in position to secure operation of both units.

32. In a calculating machine, the combination With two calculating units, of intermediate actuating mechanism adapted to intermittently effect operation of one unit by the operation of the other, a series of controlling keys for said actuating mechanism, and means for preventing operation of said keys when the calculating units are not in relative position to secure operation of them both.

In witness whereof, I have hereunto signed fmy name, this 6th day of September, 1912.

ARTHUR F. POOLE. Witnesses:

DAVID D. GOLDBERG, HYMAN ELI GOLDBERG. 

